Influence of Modulus of Base Layer on The Strain Distribution for Asphalt Pavement

Kang Yao; Xin Jiang; Jin Jiang; Zhonghao Yang; Yanjun Qiu

doi:10.7250/bjrbe.2021-16.542

Influence of Modulus of Base Layer on The Strain Distribution for Asphalt Pavement

Authors

Kang Yao School of Civil Engineering, Southwest Jiaotong University, Chengdu, China; MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China; Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China https://orcid.org/0000-0003-4368-6607
Xin Jiang School of Civil Engineering, Southwest Jiaotong University, Chengdu, China; MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China; Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China https://orcid.org/0000-0002-3044-5495
Jin Jiang School of Civil Engineering, Southwest Jiaotong University, Chengdu, China; MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China; Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China https://orcid.org/0000-0001-7251-3604
Zhonghao Yang School of Civil Engineering, Southwest Jiaotong University, Chengdu, China; MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China; Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China https://orcid.org/0000-0002-6256-451X
Yanjun Qiu School of Civil Engineering, Southwest Jiaotong University, Chengdu, China; MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, China; Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu, China https://orcid.org/0000-0002-2250-5363

DOI:

https://doi.org/10.7250/bjrbe.2021-16.542

Keywords:

Asphalt pavement, elastic modulus, Finite Element Method, mechanical response, neutral axis

Abstract

In order to investigate the influence of modulus of the base layer on the strain distribution for asphalt pavement, the modulus ratio of the base layer and the AC layer (R_m) is introduced as a controlled variable when keeping modulus of the AC layer as a constant in this paper. Then, a three-layered pavement structure is selected as an analytical model, which consists of an AC layer with the constant modulus and a base layer with the variable modulus covering the subgrade. A three dimensional (3D) finite element model was established to estimate the strains along the horizontal and vertical direction in the AC layer under different R_m. The results show that R_m will change the distribution of the horizontal strains along the depth in the AC layer; the increase of R_m could reduce the maximum tensile strain in the AC layer, but its effect is limited; the maximum tensile strain in the AC layer does not necessarily occur at the bottom, but gradually rises to the middle with the increase of R_m. R_m could significantly decline the bottom strain in the AC layer, and there is a certain difference between the bottom and the maximum strain when Rm is greater than or equal to one, which will enlarge with increasing R_m. R_m could change the depth of the neutral axis in the AC layer, and the second neutral axis will appear at the bottom of the AC layer under a sufficiently large R_m. The average vertical compressive strain in the AC layer will significantly enlarge with the increase of R_m.

Supporting Agencies

Sichuan Science and Technology Program (Grant No. 2019YFS0492)

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Influence of Modulus of Base Layer on The Strain Distribution for Asphalt Pavement

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